Beth Mason
Dr. Carl Fletcher
Coroner
Joan Fletcher
Fred Mason
District Attorney
Bob Whitney
Miss Gray
Dr. Meredith
George - Groundsman
Caretaker
Willie (as Edward M. Hyans Jr.)
Joe - Fingerprint Man (as Richard Powers)
Paula Dupree - the Ape Woman
Curley (archive footage) (uncredited)
Fred Mason (in long shots) (archive footage) (uncredited)
Court Stenographer (uncredited)
Dr. Sigmund Walters (archive footage) (uncredited)
Inquest Juror (uncredited)
Cheela (archive footage) (uncredited)
Beth's Neighbor (archive footage) (uncredited)
Ringmaster (archive footage) (uncredited)